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Oleg Nesterov cf4b8c39b9 fs/proc: do_task_stat: use sig->stats_lock to gather the threads/children stats 
[ Upstream commit 7601df8031fd67310af891897ef6cc0df4209305 ]

lock_task_sighand() can trigger a hard lockup.  If NR_CPUS threads call
do_task_stat() at the same time and the process has NR_THREADS, it will
spin with irqs disabled O(NR_CPUS * NR_THREADS) time.

Change do_task_stat() to use sig->stats_lock to gather the statistics
outside of ->siglock protected section, in the likely case this code will
run lockless.

Link: https://lkml.kernel.org/r/20240123153357.GA21857@redhat.com
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Dylan Hatch <dylanbhatch@google.com>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2024-03-15 10:48:22 -04:00
..
9p
9p: Fix initialisation of netfs_inode for 9p
2024-02-05 20:12:59 +00:00
adfs
fs: Convert block_read_full_page() to block_read_full_folio()
2022-05-09 16:21:44 -04:00
affs
affs: initialize fsdata in affs_truncate()
2023-02-01 08:34:08 +01:00
afs
afs: Fix endless loop in directory parsing
2024-03-06 14:45:09 +00:00
autofs
autofs: fix memory leak of waitqueues in autofs_catatonic_mode
2023-09-23 11:10:59 +02:00
befs
befs: Convert befs_symlink_read_folio() to use a folio
2022-08-02 12:34:03 -04:00
bfs
fs: Convert block_read_full_page() to block_read_full_folio()
2022-05-09 16:21:44 -04:00
btrfs
btrfs: send: don't issue unnecessary zero writes for trailing hole
2024-03-06 14:45:10 +00:00
cachefiles
cachefiles: fix memory leak in cachefiles_add_cache()
2024-03-01 13:26:32 +01:00
ceph
ceph: switch to corrected encoding of max_xattr_size in mdsmap
2024-03-15 10:48:13 -04:00
coda
coda: Avoid partial allocation of sig_inputArgs
2023-03-10 09:33:52 +01:00
configfs
configfs: fix possible memory leak in configfs_create_dir()
2022-12-31 13:32:22 +01:00
cramfs
fs/cramfs/inode.c: initialize file_ra_state
2023-03-10 09:34:09 +01:00
crypto
blk-crypto: add a blk_crypto_config_supported_natively helper
2023-05-11 23:03:00 +09:00
debugfs
debugfs: fix automount d_fsdata usage
2024-01-20 11:50:04 +01:00
devpts
…
dlm
fs: dlm: don't put dlm_local_addrs on heap
2024-02-16 19:06:29 +01:00
ecryptfs
ecryptfs: Reject casefold directory inodes
2024-02-05 20:12:49 +00:00
efivarfs
efivarfs: Request at most 512 bytes for variable names
2024-03-06 14:45:11 +00:00
efs
efs: Convert efs symlinks to read_folio
2022-05-09 16:21:45 -04:00
erofs
erofs: apply proper VMA alignment for memory mapped files on THP
2024-03-15 10:48:16 -04:00
exfat
exfat: support handle zero-size directory
2023-11-28 17:07:00 +00:00
exportfs
exportfs: use pr_debug for unreachable debug statements
2024-03-06 14:45:15 +00:00
ext2
ext2: fix datatype of block number in ext2_xattr_set2()
2023-09-23 11:11:05 +02:00
ext4
ext4: correct the hole length returned by ext4_map_blocks()
2024-03-01 13:26:28 +01:00
f2fs
f2fs: add helper to check compression level
2024-02-16 19:06:31 +01:00
fat
treewide: use get_random_u32() when possible
2022-10-11 17:42:58 -06:00
freevxfs
freevxfs: Convert vxfs_immed_read_folio() to use a folio
2022-08-02 12:34:03 -04:00
fscache
netfs, fscache: Prevent Oops in fscache_put_cache()
2024-01-31 16:17:04 -08:00
fuse
fuse: share lookup state between submount and its parent
2024-01-01 12:39:08 +00:00
gfs2
gfs2: Fix kernel NULL pointer dereference in gfs2_rgrp_dump
2024-01-25 15:27:22 -08:00
hfs
hfs: fix missing hfs_bnode_get() in __hfs_bnode_create
2023-03-10 09:34:07 +01:00
hfsplus
fs: hfsplus: remove WARN_ON() from hfsplus_cat_{read,write}_inode()
2023-05-24 17:32:34 +01:00
hostfs
hostfs: move from strlcpy with unused retval to strscpy
2022-09-19 22:46:25 +02:00
hpfs
hpfs: Convert symlinks to read_folio
2022-05-09 16:21:45 -04:00
hugetlbfs
mm: hugetlb pages should not be reserved by shmat() if SHM_NORESERVE
2024-02-23 09:12:46 +01:00
iomap
iomap: update ki_pos a little later in iomap_dio_complete
2023-12-08 08:51:20 +01:00
isofs
- hfs and hfsplus kmap API modernization from Fabio Francesco
2022-10-12 11:00:22 -07:00
jbd2
jbd2: fix soft lockup in journal_finish_inode_data_buffers()
2024-01-20 11:50:07 +01:00
jffs2
jffs2: reduce stack usage in jffs2_build_xattr_subsystem()
2023-07-19 16:22:11 +02:00
jfs
jfs: fix array-index-out-of-bounds in diNewExt
2024-02-05 20:12:48 +00:00
kernfs
fs/kernfs/dir: obey S_ISGID
2024-02-05 20:12:58 +00:00
lockd
lockd: fix file selection in nlmsvc_cancel_blocked
2024-03-06 14:45:16 +00:00
minix
vfs: open inside ->tmpfile()
2022-09-24 07:00:00 +02:00
netfs
netfs: Only call folio_start_fscache() one time for each folio
2023-10-06 14:56:32 +02:00
nfs
trace: Relocate event helper files
2024-03-06 14:45:17 +00:00
nfs_common
…
nfsd
nfsd: don't destroy global nfs4_file table in per-net shutdown
2024-03-06 14:45:17 +00:00
nilfs2
nilfs2: replace WARN_ONs for invalid DAT metadata block requests
2024-02-23 09:12:52 +01:00
nls
fs/nls: make load_nls() take a const parameter
2023-09-13 09:42:22 +02:00
notify
fanotify: disallow mount/sb marks on kernel internal pseudo fs
2023-07-19 16:22:05 +02:00
ntfs
- hfs and hfsplus kmap API modernization from Fabio Francesco
2022-10-12 11:00:22 -07:00
ntfs3
fs/ntfs3: Fix NULL pointer dereference in 'ni_write_inode'
2024-03-06 14:45:06 +00:00
ocfs2
fs: ocfs2: namei: check return value of ocfs2_add_entry()
2023-09-13 09:42:33 +02:00
omfs
fs: Convert block_read_full_page() to block_read_full_folio()
2022-05-09 16:21:44 -04:00
openpromfs
…
orangefs
use less confusing names for iov_iter direction initializers
2023-02-09 11:28:04 +01:00
overlayfs
ima: detect changes to the backing overlay file
2023-11-28 17:07:12 +00:00
proc
fs/proc: do_task_stat: use sig->stats_lock to gather the threads/children stats
2024-03-15 10:48:22 -04:00
pstore
pstore/ram: Fix crash when setting number of cpus to an odd number
2024-02-05 20:12:48 +00:00
qnx4
fs: Convert block_read_full_page() to block_read_full_folio()
2022-05-09 16:21:44 -04:00
qnx6
fs/qnx6: delete unnecessary checks before brelse()
2022-09-11 21:55:07 -07:00
quota
quota: explicitly forbid quota files from being encrypted
2023-11-28 17:07:13 +00:00
ramfs
shmem: use ramfs_kill_sb() for kill_sb method of ramfs-based tmpfs
2023-07-19 16:22:11 +02:00
reiserfs
reiserfs: Check the return value from __getblk()
2023-09-13 09:42:27 +02:00
romfs
romfs: Convert romfs to read_folio
2022-05-09 16:21:46 -04:00
smb
smb3: clarify mount warning
2024-03-01 13:26:30 +01:00
squashfs
revert "squashfs: harden sanity check in squashfs_read_xattr_id_table"
2023-02-22 12:59:50 +01:00
sysfs
…
sysv
fs/sysv: Null check to prevent null-ptr-deref bug
2023-08-11 12:08:23 +02:00
tracefs
tracefs: Add missing lockdown check to tracefs_create_dir()
2023-09-23 11:11:12 +02:00
ubifs
ubifs: ubifs_symlink: Fix memleak of inode->i_link in error path
2024-01-31 16:17:02 -08:00
udf
udf: initialize newblock to 0
2023-09-13 09:43:05 +02:00
ufs
ufs: replace ll_rw_block()
2022-09-11 20:26:07 -07:00
unicode
…
vboxsf
vboxsf: Convert vboxsf to read_folio
2022-05-09 16:21:46 -04:00
verity
fsverity: skip PKCS#7 parser when keyring is empty
2023-09-13 09:43:03 +02:00
xfs
xfs: read only mounts with fsopen mount API are busted
2024-01-31 16:17:08 -08:00
zonefs
zonefs: Improve error handling
2024-02-23 09:12:45 +01:00
aio.c
fs/aio: Restrict kiocb_set_cancel_fn() to I/O submitted via libaio
2024-03-01 13:26:39 +01:00
anon_inodes.c
dynamic_dname(): drop unused dentry argument
2022-08-20 11:34:04 -04:00
attr.c
attr: block mode changes of symlinks
2023-09-23 11:11:10 +02:00
bad_inode.c
vfs: open inside ->tmpfile()
2022-09-24 07:00:00 +02:00
binfmt_elf_fdpic.c
fs: binfmt_elf_efpic: fix personality for ELF-FDPIC
2023-10-06 14:57:06 +02:00
binfmt_elf_test.c
…
binfmt_elf.c
mm: always expand the stack with the mmap write lock held
2023-07-01 13:16:25 +02:00
binfmt_flat.c
…
binfmt_misc.c
binfmt_misc: fix shift-out-of-bounds in check_special_flags
2022-12-31 13:32:57 +01:00
binfmt_script.c
…
buffer.c
- hfs and hfsplus kmap API modernization from Fabio Francesco
2022-10-12 11:00:22 -07:00
char_dev.c
chardev: fix error handling in cdev_device_add()
2022-12-31 13:32:41 +01:00
compat_binfmt_elf.c
…
coredump.c
coredump: Move dump_emit_page() to kill unused warning
2023-02-22 12:59:50 +01:00
d_path.c
d_path.c: typo fix...
2022-08-20 11:34:33 -04:00
dax.c
Merge branch 'for-6.0/dax' into libnvdimm-fixes
2022-09-24 18:14:12 -07:00
dcache.c
fast_dput(): handle underflows gracefully
2024-02-05 20:12:54 +00:00
direct-io.c
block: remove PSI accounting from the bio layer
2022-09-20 08:24:38 -06:00
drop_caches.c
…
eventfd.c
eventfd: prevent underflow for eventfd semaphores
2023-09-13 09:42:27 +02:00
eventpoll.c
epoll: ep_autoremove_wake_function should use list_del_init_careful
2023-06-21 16:00:54 +02:00
exec.c
exec: Fix error handling in begin_new_exec()
2024-01-31 16:17:07 -08:00
fcntl.c
keep iocb_flags() result cached in struct file
2022-06-10 16:10:23 -04:00
fhandle.c
do_sys_name_to_handle(): constify path
2022-09-01 17:36:39 -04:00
file_table.c
locks: fix TOCTOU race when granting write lease
2022-08-16 10:59:54 -04:00
file.c
file: reinstate f_pos locking optimization for regular files
2023-08-11 12:08:23 +02:00
filesystems.c
…
fs_context.c
vfs, security: Fix automount superblock LSM init problem, preventing NFS sb sharing
2023-09-13 09:42:28 +02:00
fs_parser.c
ext4: journal_path mount options should follow links
2023-01-07 11:11:59 +01:00
fs_pin.c
…
fs_struct.c
…
fs_types.c
…
fs-writeback.c
writeback, cgroup: switch inodes with dirty timestamps to release dying cgwbs
2023-11-20 11:51:50 +01:00
fsopen.c
uninline may_mount() and don't opencode it in fspick(2)/fsopen(2)
2022-05-19 23:25:10 -04:00
init.c
…
inode.c
filemap: add a per-mapping stable writes flag
2024-01-10 17:10:32 +01:00
internal.h
nfs: use vfs setgid helper
2023-08-30 16:11:10 +02:00
ioctl.c
lsm: new security_file_ioctl_compat() hook
2024-01-31 16:17:00 -08:00
Kconfig
smb: move client and server files to common directory fs/smb
2023-06-28 11:12:40 +02:00
Kconfig.binfmt
Xtensa updates for v6.1
2022-10-10 14:21:11 -07:00
kernel_read_file.c
fs/kernel_read_file: allow to read files up-to ssize_t
2022-06-16 19:58:21 -07:00
libfs.c
libfs: add DEFINE_SIMPLE_ATTRIBUTE_SIGNED for signed value
2022-12-31 13:31:58 +01:00
locks.c
filelock: add a new locks_inode_context accessor function
2024-03-06 14:45:16 +00:00
Makefile
smb: move client and server files to common directory fs/smb
2023-06-28 11:12:40 +02:00
mbcache.c
ext4: fix deadlock due to mbcache entry corruption
2023-01-07 11:12:02 +01:00
mount.h
switch try_to_unlazy_next() to __legitimize_mnt()
2022-07-05 16:18:21 -04:00
mpage.c
Folio changes for 6.0
2022-08-03 10:35:43 -07:00
namei.c
rename(): fix the locking of subdirectories
2024-01-31 16:17:02 -08:00
namespace.c
fs: relax mount_setattr() permission checks
2024-02-23 09:12:46 +01:00
no-block.c
…
nsfs.c
dynamic_dname(): drop unused dentry argument
2022-08-20 11:34:04 -04:00
open.c
open: make RESOLVE_CACHED correctly test for O_TMPFILE
2023-08-11 12:08:22 +02:00
pipe.c
pipe: wakeup wr_wait after setting max_usage
2024-01-31 16:17:09 -08:00
pnode.c
pnode: terminate at peers of source
2023-01-04 11:29:01 +01:00
pnode.h
…
posix_acl.c
- Yu Zhao's Multi-Gen LRU patches are here. They've been under test in
2022-10-10 17:53:04 -07:00
proc_namespace.c
vfs: escape hash as well
2022-06-28 13:58:05 -04:00
read_write.c
use less confusing names for iov_iter direction initializers
2023-02-09 11:28:04 +01:00
readdir.c
Change calling conventions for filldir_t
2022-08-17 17:25:04 -04:00
remap_range.c
- The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe
2022-08-05 16:32:45 -07:00
select.c
…
seq_file.c
use less confusing names for iov_iter direction initializers
2023-02-09 11:28:04 +01:00
signalfd.c
…
splice.c
mm: merge folio_has_private()/filemap_release_folio() call pairs
2024-01-10 17:10:31 +01:00
stack.c
…
stat.c
vfs: support STATX_DIOALIGN on block devices
2022-09-11 19:47:12 -05:00
statfs.c
statfs: enforce statfs[64] structure initialization
2023-05-24 17:32:51 +01:00
super.c
fs: Protect reconfiguration of sb read-write from racing writes
2023-08-11 12:08:24 +02:00
sync.c
…
sysctls.c
…
timerfd.c
…
userfaultfd.c
Revert "userfaultfd: don't fail on unrecognized features"
2023-04-26 14:28:37 +02:00
utimes.c
…
xattr.c
fs: don't audit the capability check in simple_xattr_list()
2022-12-31 13:31:55 +01:00